I like the T-grip in certain applications. I like it with magnas on a J-frame square butt. Nobody and I mean NOBODY makes a good compact/boot style grip for a SB J-frame.
I also very much like them on N-frames made before target stocks were available. They just look and feel right.
The last time I ordered from Tyler was at least 10 years ago, maybe more. IIRC I ordered 10 T-grips in various sizes. Even then it was something like 6-8 months before I got my order.
I've thought about ordering some since then, but tried to call first just to be sure my order would be filled. Never could get anybody on the phone.
They do pop up on e-bay or GB and such. You'll pay dearly for 'em, but you will get 'em.